My favorite .22 scope is the Mueller 4.5-14x40 APV or APT. They have great quality glass for the money. You can find the APV for ~$125 and the APT for ~$25-30 more.
I agree with WNYcollector. I put a Mueller APT on my 22 mag and I'm completely satisfied with it. I've seen better scopes but you also pay a lot more. For the money they can't be beat.
wow mueller seems to be killing the competition. just the same, I would recommend the nikon prostaff fixed 4x rimfire version. I've always had luck with their variable zoom prostaffs